Leo pressed his own palm to his ribs. “Mine sound okay?”
“Doors?”
The boy, Leo, looked up. “Why does it make that sound? Like a tiny shoe inside?” what causes the lub dub sound of the heartbeat
“Perfect,” she said. “Your doors are doing their job.” Leo pressed his own palm to his ribs
Dr. Elara Vance had listened to thousands of heartbeats. But today, with the stethoscope pressed to a young boy’s chest, she paused. what causes the lub dub sound of the heartbeat